Nissan Qashqai (2007-2010). Manual - part 332

P1144 HO2S1

EC-847

< COMPONENT DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

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Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and warm it up to normal operating temperature.

2.

Stop engine and wait at least 10 seconds.

3.

Turn ignition switch ON and select “HO2S1 (B1) P1143” of “HO2S1” in “DTC WORK SUPPORT” mode
with CONSULT-III.

4.

Touch “START”.

5.

Start engine and let it idle for at least 3 minutes.
NOTE:
Never raise engine speed above 3,600 rpm after this step. If the engine speed limit is exceeded,
return to step 5.

6.

When the following conditions are met, “TESTING” will be displayed on the CONSULT-III screen. Maintain
the conditions continuously until “TESTING” changes to “COMPLETED”. (It will take approximately 50
seconds or more.)

CAUTION:

Always drive vehicle at a safe speed.

If “TESTING” is not displayed after 5 minutes, retry from step 2.

7.

Touch “SELF-DIAG RESULT”

Which is displayed on CONSULT-III screen?

OK

>> INSPECTION END

NG

>> Go to 

EC-845, "Diagnosis Procedure"

.

3.

PERFORM COMPONENT FUNCTION CHECK

With GST

1.

Start engine and warm it up to normal operating temperature.

2.

Set voltmeter probes between EM harness connector and ground under the following condition.

NOTE:
Use component function check to check the overall function of the heated oxygen sensor 1 circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-845, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001089431

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection E21. Refer to Ground Inspection in 

GI-41, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

ENG SPEED

A/T: 1,375 - 2,600 rpm
M/T: 1,375 - 2,600 rpm

VHCL SPEED SE

Less than 100 km/h (62 MPH)

B/FUEL SCHDL

A/T: 3.7 - 10.0 msec
M/T: 3.7 - 10.0 msec

Shift lever

Suitable position

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

49

(HO2S1 signal)

Ground

Engine speed held at 2,000 rpm con-
stant under no load

• The maximum voltage is over 0.8 at least 1 time.
• The minimum voltage is over 0.35 at least 1 

time.

EC-848

< COMPONENT DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

P1144 HO2S1

NO

>> Repair or replace ground connection.

2.

RETIGHTEN HEATED OXYGEN SENSOR 1

Loosen and retighten heated oxygen sensor 1.

>> GO TO 3.

3.

CLEAR THE SELF-LEARNING DATA

1.

Clear the mixture ratio self-learning value, refer to 

EC-649, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

.

2.

Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0172 detected or difficult to start engine?

Yes

>> Perform trouble diagnosis for DTC P0172. Refer to 

EC-791, "DTC Logic"

.

No

>> GO TO 4

4.

CHECK HO2S1 CONNECTOR FOR WATER

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 1 harness connector.

3.

Check connectors for water.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness or connectors.

5.

CHECK HEATED OXYGEN SENSOR 1 HEATER

Refer to 

EC-776, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace heated oxygen sensor 1.

6.

CHECK HEATED OXYGEN SENSOR 1

Refer to 

EC-762, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace heated oxygen sensor 1.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000001089432

1.

INSPECTION START

Do you have CONSULT-III?

Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK HEATED OXYGEN SENSOR 1

 With CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

Tightening torque: 50 N·m (5.1 kg-m, 37 ft-lb)

Water should not exist.

P1144 HO2S1

EC-849

< COMPONENT DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

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2.

Set “POST TRIGGER” to 100% in “DATA MONITOR” mode with CONSULT-III.

3.

Select “HO2S1 (B1)” and “HO2S1 MNTR (B1)”.

4.

Hold engine speed at 2,000 rpm under no load during the following steps.

5.

Touch “RECORD” on CONSULT-III screen.

6.

Check the following.

-

“HO2S1 MNTR (B1)” in “DATA MONITOR” mode changes from
“RICH” to “LEAN” to “RICH” more than 5 times in 10 seconds.

5 times (cycles) are counted as shown in the figure.

-

“HO2S1 (B1)” voltage goes above 0.6V at least once.

-

“HO2S1 (B1)” voltage goes below 0.3V at least once.

-

“HO2S1 (B1)” voltage never exceeds 1.0V.

CAUTION:

•

Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m
(19.7 in) onto a hard surface such as a concrete floor; use a new one.

•

Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor
Thread Cleaner tool and approved anti-seize lubricant.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 4.

3.

CHECK HEATED OXYGEN SENSOR 1

 Without CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Check the voltage between ECM harness connector and ground under the following condition.

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner tool and approved anti-seize lubricant.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 4.

SEF217YA

JMBIA0352ZZ

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

49

(HO2S1 signal)

Ground

Engine speed held at 
2,000 rpm constant under 
no load

• The voltage fluctuates between 0 to 0.3V and 0.6 to 

1.0V more than 5 times within 10 seconds.

• The maximum voltage is over 0.6V at least 1 time.
• The minimum voltage is below 0.3V at least 1 time.
• The voltage never exceeds 1.0V.

1 time: 0 - 0.3V 

→

 0.6 - 1.0V 

→

 0 - 0.3V

2 times: 0 - 0.3V 

→

 0.6 - 1.0V 

→

 0 - 0.3V 

→

 0.6 - 1.0V 

→

 0 - 0.3V

EC-850

< COMPONENT DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

P1144 HO2S1

4.

REPLACE HEATED OXYGEN SENSOR 1

Replace heated oxygen sensor 1.

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner tool and approved anti-seize lubricant.

>> INSPECTION END